<template>
  <div>
    <div class="shop-card">
      <div class="content" @click="totalList">
        <div class="content-left">
          <div class="logo-warrper">
            <div class="logo" :class="{'highlight':totalCount>0}">
              <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
            </div>
            <div class="num" v-show="totalPrice>0">
              {{totalCount}}
            </div>
          </div>
          <div class="price" :class="{'highlight':totalPrice>0}">
            ￥{{totalPrice}}
          </div>
          <div class="desc">
            另需配送费￥{{deliveryPrice}}元
          </div>
        </div>
        <div class="content-right">
          <div class="pay" :class="payClass">
            {{payDesc}}
          </div>
        </div>
      </div>
      <div class="ball-container">
        <transition name='drop'
                    tag="div"
                    v-for="(ball,index) in balls"
                    :key="index"
                    @before-enter="dropBeforeEnter" @enter="dropEnter" @after-enter="dropAfterEnter">
          <div class="ball" v-show="ball.show">
            <div class="inner inner-hood"></div>
          </div>
        </transition>
      </div>
      <transition name="slide">
        <div class="shopcard-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li v-for="food in selectFoods" class="food">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price * food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cart-conrtrol :food="food"></cart-conrtrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>

    </div>
    <transition name="fade">
      <div class="shop-mask" v-show="listShow"></div>
    </transition>
  </div>

</template>

<script>
  import cartConrtrol from 'components/cartcortrol/cartcortrol'
  import BScroll from 'better-scroll';

  export default {
    props: {
      selectFoods: {
        type: Array,
        default() {
          return []
        }
      },
      deliveryPrice: {
        type: Number,
        default: 0
      },
      minPrice: {
        type: Number,
        default: 0
      }
    },
    data() {
      return {
        balls: [
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          }
        ],
        dropBalls: [],
        flod: false
      }
    },
    computed: {
      totalPrice() {
        /*eslint-disable*/
        let total = 0;
        this.selectFoods.forEach((food) => {
          total += food.price * food.count
        });
        return total
      },
      totalCount() {
        let count = 0;
        this.selectFoods.forEach((food) => {
          count += food.count
        });
        return count
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice;
          return `还差${diff}元起送`
        } else {
          return '其结算'
        }
      },
      // 通过计算属性绑定class
      payClass() {
        if (this.totalPrice < this.minPrice) {
          return 'not-enough'
        } else {
          return "enough"
        }
      },
      listShow() {
        if (!this.totalCount) {
          this.flod = true;
          return false
        }
        let show = !this.flod;
        if (show) {
          this.$nextTick(() => {
            if(!this.scroll){
              this.scroll =new BScroll(this.$refs.listContent,{
                click: true
              })
            }else{
              this.scroll.refresh()
            }

          })
        }
        return show
      }
    },
    created() {
      // vue2.0 事件单一管理
      this.Event.$on('cartAdd', (el) => {
        this.$nextTick(() => {
          this.drop(el);
        })
      });
    },
    methods: {
      drop(el) {
        //触发一次事件就会将所有小球进行遍历
        for (let i = 0; i < this.balls.length; i++) {
          let ball = this.balls[i];
          if (!ball.show) { //将false的小球放到dropBalls
            ball.show = true;
            ball.el = el; //设置小球的el属性为一个dom对象
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      dropBeforeEnter(el) {
        let count = this.balls.length;
        while (count--) {
          let ball = this.balls[count];
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect(); //获取小球的相对于视口的位移(小球高度)
            let x = rect.left - 32;
            let y = -(window.innerHeight - rect.top - 22); //负数,因为是从左上角往下的的方向
            el.style.display = ''; //清空display
            el.style.webkitTransform = `translate3d(0,${y}px,0)`;
            el.style.transform = `translate3d(0,${y}px,0)`;
            //处理内层动画
            let inner = el.getElementsByClassName('inner-hood')[0];
            inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
            inner.style.transform = `translate3d(${x}px,0,0)`;
          }
        }
      },
      dropEnter(el, done) { //这个方法的执行是因为这是一个vue的监听事件
        /* eslint-disable no-unused-vars */
        let rf = el.offsetHeight; //触发重绘html
        this.$nextTick(() => { //让动画效果异步执行,提高性能
          el.style.webkitTransform = 'translate3d(0,0,0)';
          el.style.transform = 'translate3d(0,0,0)';
          let inner = el.getElementsByClassName('inner-hood')[0];
          inner.style.webkitTransform = 'translate3d(0,0,0)';
          inner.style.transform = 'translate3d(0,0,0)';
          el.addEventListener('transitionend', done);
        });
      },
      dropAfterEnter(el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      },
      // 显示购物车
      totalList() {
        if (!this.totalCount) {
          return;
        }
        this.flod = !this.flod
      },
     // 清空购物车
      empty() {
        this.selectFoods.forEach((food)=>{
          food.count = 0
        })
      }
    },
    components: {
      cartConrtrol
    }
  }
</script>

<style lang="stylus" rel="stylesheet/stylus" scoped>
  @import "../../common/stylus/mixin.styl"

  .shop-card
    position: fixed
    left: 0
    bottom: 0
    z-index: 50
    width: 100%
    height: 48px
    .content
      display: flex
      background: #141d27
      font-size: 0
      color: rgba(255, 255, 255, 0.1)
      .content-left
        flex: 1
        .logo-warrper
          display: inline-block
          position: relative
          top: -10px
          margin: 0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing: border-box
          vertical-align: top
          border-radius: 50%
          background: #141d27
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            background: #2d343c
            text-align: center
            &.highlight
              background: rgb(0, 160, 220)
            .icon-shopping_cart
              font-size: 24px
              color: #80858a
              line-height: 44px
              &.highlight
                color: #ffffff
          .num
            position: absolute
            top: 0
            right: 0
            width: 24px
            height: 16px
            line-height: 16px
            text-align: center
            border-radius: 16px
            font-size: 9px
            font-weight: 700
            color: #fff
            background: rgb(240, 20, 20)
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4)
        .price
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin-top: 12px
          padding-right: 12px
          box-sizing: border-box
          border-right: 1px solid rgba(255, 255, 255, 0.1)
          font-size: 16px
          font-weight: 700
          &.highlight
            color: #fff
        .desc
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin: 12px 0 0 12px
          font-size: 10px
      .content-right
        flex: 0 0 105px
        width: 105px
        .pay
          height: 48px
          line-height: 48px
          text-align: center
          font-size: 12px
          font-weight: 700
          background: #2d333d
          &.not-enough
            background: #2d333d
          &.enough
            background: #00b43c
            color: #fff
    .ball-container
      .ball
        position: fixed
        left: 32px
        bottom: 22px
        z-index: 200
        .inner
          transition: all 0.4s cubic-bezier(0, 1.25, 1, .92);
          width: 16px
          height: 16px
          border-radius: 50%
          background: rgb(0, 160, 220)

    .drop-enter-active, .drop-leave-active
      transition: all 0.4s linear;
      cubic-bezier(.17, .67, .19, 1.19)

    .shopcard-list
      position: absolute
      bottom: 48px
      left: 0
      z-index: -1
      width: 100%
      &.slide-enter-active, &.slide-leave-active
        transition: all 0.2s
      &.slide-enter, &.slide-leave-to
        transform: translate3d(0, 214px, 0)
      .list-header
        height: 40px
        line-height: 40px
        padding: 0 18px
        background: #f3f5f7
        border-bottom: 1px solid rgba(7, 17, 27, 0.1)
        .title
          float: left
          font-size: 14px
          color: rgb(7, 17, 27)
        .empty
          float: right
          font-size: 12px
          color: rgb(0, 160, 220)
      .list-content
        padding: 0 18px
        max-height: 217px
        background: #ffffff
        overflow: hidden
        .food
          position: absolute
          padding: 12px 0px
          box-sizing: border-box
          border-1px(rgba(7, 17, 27, 0.1))
          .name
            line-height: 24px
            font-size: 14px
            color: rgb(7, 17, 27)
          .price
            position: absolute
            right: 90px
            bottom: 12px
            line-height: 24px
            font-size: 14px
            font-weight: 700
            color: rgb(240, 20, 20)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 6px

  .shop-mask
    position: fixed
    top: 0px
    left: 0
    z-index: 40
    width: 100%
    height: 100%
    backdrop-filter:blur(10px)
    background:rgba(7,17,27,.6)
    &.fade-enter-active, &.fade-leave-active
      transition: all 0.2s
    &.fade-enter, &.fade-leave-to
      opacity: 0

</style>
